Ford Alternator Conversion
For what it's worth...
I did an alternator conversion on my '63, but didn't do the 1-wire thing. I used the diagram in this link:
http://www.mustangsteve.com/GENtoALT.html
It uses your existing wire harness, except that you need to add two wires, clearly noted on the diagram. I used the alternator from the '67 Mustang that donated my [first] 200 engine. I bought a new regulator from the local parts store, and used a #10-12 Quick Splice from the local True Value hardware store for my "junction block". It was easier that I expected.
One additional thing that I've read on other forums, but not included in this diagram, is the addition of a 15-0hm resistor across the charge indicator light. I got a 15-ohm resistor from Radio Shack and spliced it in behind the instrument cluster. That was kind of a hassle; had to remove the instrument cluster. MY guess is this is merely to reduce the voltage across the indicator light so it lasts longer. Without the resistor, the charge light would probably get a quick blast of 15 volts when you first fire up. I don't know how important this is, but you sure don't want your indicator light burning out if it's your only indication!
Anyhow... I'm just sayin'....